How many grams of sodium contain the same number of atoms as 14.9 g of potassium?

Answer 1

First, find the number of atoms in 14.9 g potassium (K)

14.9 g K x 1 mol K / 39.1 g x 6.02x10²³ atoms / mole = 2.29x10²³ atoms of K

Now use 2.29x10²³ atoms of K and find out how many g of sodium (Na) is equivalent to this

2.29x10²³ atoms x 1 mol Na / 6.02x1023 atoms x 23.0 g Na / mol Na = 8.75 g Na

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14.9 g K x 1 mol K / 39.1 g = 0.381 mols K

0.381 mols Na x 23 g Na / mol = 8.76 g Na